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On April 16,2004 pump and treat remediation began with pumping the extraction well,pumping the <br /> water through an activated carbon filter, filling the tark, sample and testing the cleaned water,and <br /> trucking the water to the industrial sewer. Quality control samples were taken and analyzed weekly. <br /> kSA <br /> XTNG B"EXTRACTION WpEILgLC g MOL E p�N� <br /> IN <br /> NT FOR U[VT R?ED GROUNSWAT_9 BAKER AlNG 4"CONDUIT <br /> G i7 X 20 B LOW GROUND CONC.VAULT <br /> 1.25"DISC ARGE LINE TO BAKER TA <br /> C T IST G C ROAD <br /> BAKER TANK 2i3ODO <br /> CA BON CANISTER <br /> SABLE PUMP VOL.=+/-12 GPM MAX <br /> WELL AT-W. .0-46 <br /> r <br /> GENERAL SCHEMATIC SKETCH OF PUMP&TREAT SYSTEM <br /> FOOTHILL ENGINE INC LOCH,CA <br /> Over the Memorial Day weekend the pump and treat system was turned off to allow the ground <br /> water to recharge and to recollect any contaminants that might of stuck to the soil particles during <br /> draw down. The pump and treat.system resumed on M onday afternoon 5131104: The pump and treat <br /> system was turned off for final closure on June 16, 2004 and final samples of the monitoring wells <br /> were taken June 17, 2004. The well pump and tank and filters were removed on Tuesday,June 22, <br /> 2004. <br /> Quarterly monitoring has resumed with the Third Quarter of 2004, September 17, 2004. The first <br /> Quarter of 2005 was not sampled as we were wai Ing for a determination of acceptance. The <br /> determination was made to sample again with the hi -ter groundwater table of this spring,spring of <br /> 2005. The results of the recent monitoring were favorable. San Joaquin County Public Health <br /> Services,Environmental Health Department issued a 30 day notice of concurrence to the California <br /> Regional Water Quality Control Board. The Board concurred with closure on August 23, 2005. <br /> CLOSER PLAN <br /> Monitoring and Extraction Wells <br /> The low occurrence of contaminated soil on this ite indicates a zero threat of vertical cross <br /> contamination between horizontal aquifers via the sand filter of the wells. In order to minimize <br /> impact to traffic and business, Foothill Engineering recommends that grouting of the well casing <br /> with a tremie pipe and capping("mushroom")be used versus over drilling. Grout mix and capping <br /> should be performed per the "San Joaquin County public Health Services, Environmental Health <br /> Division- Well Standards".. <br /> Grout mix will be a neat cement grout with 5 to 10 gallons of water per one 941b bag of cement. <br /> Mushroom capping will be one foot bigger in diame ter,three foot deep, and one foot thick. The <br /> casing will be cut off to protrude 6"into the cap. 314"concrete will be used to cap wells on Highway <br /> 12, sidewalk and the Starbuck's drive through. The concrete will be treated with an admixture of <br />